Pulse or digital communications – Repeaters – Testing
Patent
1995-02-08
1998-07-28
Vo, Don N.
Pulse or digital communications
Repeaters
Testing
375367, 375208, H04B 1707
Patent
active
057871124
ABSTRACT:
A data demodulator circuit for spread spectrum communication, presenting improved demodulation characteristics by allowing the elimination of the influence of a carrier offset remaining after down converting, and the removal of the interference caused by pilot signals with different timing. In-phase axis receive signal and operate with their respective reception timing of pilots signal. Phase difference information is extracted from the input signals and the signals are delayed to insure that the extracted phase difference information is equivalent to the average phase revolution. The influence of the carrier offset is eliminated by use of the extracted phase difference information. A data demodulator with canceler removes an interference I.sub.DF of pilot signals with different timing originating from the outputs of an interference amount calculator.
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K. Takahashi, M. Takeishi, H. Ohnishi "A Study On Frequency Off-Set Compensation for DS/QPSK" Electronic Info Communication Soc.
Mitsubishi Denki & Kabushiki Kaisha
Vo Don N.
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